INVALCO. Table of Contents. Water Cut Monitor with Temperature Compensation Model WCM 7300 Installation/Operation Manual

Transcription

1 June 2001 INVALCO Water Cut Monitor with Temperature Compensation Model WCM 7300 Installation/Operation Manual Bulletin MNIS005 Table of Contents General Overview Specifications and Definitions...3 Error Messages...4 Product Temperature Compensation...4 Set Point and Loop Calibration...5 Program Flow Chart...5 Quick Steps...6 Programming of WCM Installation...7 Electrical Connections...8 Trouble Shooting Dimensions...11 FMC Issue/Rev. INVALCO 0.4 (6/01) Fluid Control P.O. Box 1377 Stephenville, Texas Telephone: 254/ FAX 254/ Toll Free: 800/ Page 1

2 INVALCO Model 7300 WCM The Model 7300 WCM is designed to: Accurately measure trace amounts of water in flowing hydrocarbon steams. Automatically compensate for reading changes caused by temperature variation of the flowing fluid. Display the information on a LCD readout. Provide an adjustable timed relay closure for control purposes and a analog output for remote readout. For first time users, we recommend reading the general comments/trouble shooting on pages 9-11 for answers to the most frequently asked questions about the Calibration of the WCM 7300 The Model 7300 is calibrated by pressing the three buttons located below the LCD on the instrument front. number to continuously move up/down following minute changes in the chemical/physical composition of the hydrocarbon stream. 2. Temperature of the flowing stream. The readings can be changed from F to C by pressing the LEFT button. This can not be done with the magnet. 3. Electrical capacitance value of the probe in picofarads. Two reading are displayed. Ignore the one on the left which will be roughly 100 points higher than the one on the right. The number on the right is the value of the probe as measured by the This is the value used by the electronics in analyzing the fluid stream. The number normally will be between 150 and 275 depending on the gravity of the oil, residual production/drilling chemicals, water cut, gas content, etc. This reading can be valuable if you ever need to trouble shoot your system. It should be recorded at initial installation for future reference. It should be a steady reading. A change of.4 to.5 pf can change the reading of the 7300 by.1%. If anything varies in the process stream making this reading fluctuate, the readings of the 7300 will also fluctuate as it follows the probe value. CUT STATUS ç é ENTER The button on the left is pressed to scroll a flashing digit from right to left. It is to be pressed when the word LEFT or a left pointing arrow ç, is used in calibration. The button in the center is pressed to scroll a flashing digit to the next higher number. It is pressed when the word UP, or an upward pointing arrow é, is used in calibration. The button on the right is pressed to ENTER information, or to move to the next item on the menu. The CUT STATUS light is an LED that can be green, red, steady, or flashing, depending on probe conditions. After calibration, the LCD reading may be toggled by pressing the center UP arrow button or by moving the supplied magnet lengthwise on top of the condulet, from the front to the rear, at the 11 o clock position. Use the button if the condulet cover is off; or the magnet if the cover is on. When toggled by either of these methods, the 7300 WCM will display the following: 1. Percent water cut in units, tenths and hundredths. It is normal and to be expected for the hundredth General Information The WCM 7300 is able to measure trace amounts of contamination by monitoring changes in the dielectric constant (Dk) of the process fluid. The probe functions as a large capacitor in the process stream with an inner pipe or electrode forming one plate of the capacitor and the outer pipe forming the other plate of the capacitor (Figure 1). Oil and water both have dielectric properties, however, their dielectric constants are very dissimilar. Oil typically has a Dk of 2.0± and water has a Dk of 80. The dielectric properties cause the probe to act like a small battery. The amount of energy stored in the probe is a measure of the dielectric capacity or capacitance. As water contamination occurs, the Dk of the oil changes, altering the capacitance of the probe. Figure 1 Page 2 Issue/Rev. 0.4 (6/01)

3 By placing a small amount of high frequency alternating current on the probe inner electrode, it is possible to detect changes in the dielectric. Knowing the area of the electrodes and the Dk of the oil, it is possible to determine the capacitance of a probe when full of clean oil or other hydrocarbons. Should the oil become contaminated with water, changes in the capacitance are displayed as a percent contamination of the oil. Specifications Temperature Unit: -4 F to 158 F ( -20 C to 70 C). Process (Oil): 0 F to 218 F (-18 C to 103 C). Power 18 to 32 Vdc (24 Vdc nominal) at 250 ma maximum. Range of Dielectric Constant (Dk) 1.7 to 5.0 Accuracy Is defined as the amount of variance observed between the 7300 reading and the water grindout of the oil flowing through the probe. Normal variances are: ± From 0 to 5% water cut. ±.1... From 5 to 10% water cut. ± From 10 to 25% water cut. Output Display: 16-character alphanumeric Relay: SPDT rated 10 Amp at 24 Vdc. : Loop powered. Isolated to ±4 Volts Common Mode. Enclosure NEMA 7 explosion-proof, Class I, Division 2, Group C and D. Process Connections Flange, grooved, MNPT. Definitions Cut - A term commonly used to describe the % water by volume in the product stream. S&W - The term S&W is referring to water and other contaminants in the hydrocarbon (oil) product stream. Grindout - A test performed on an oil sample to determine % water by volume. This is normally by centrifuging, but may be done by other methods. TC - Temperature coefficient for temperature compensation of the oil. Dk - Abbreviation for dielectric constant. Dielectric Constant - An electrical property of all materials which (in this case) is used to differentiate between water and oil. Display Definitions There are many messages used to communicate information on data entry. The messages are summarized in the following: Program Mode - To enter program mode, press all three buttons simultaneously. Program Mode - To enter the calibration menu, press the buttons in the following sequence. Left, Left, Left, Up, Up. If entered incorrectly, the display will revert to the 20mA = menu. If this is the case, press until the unit is in normal operating mode (displaying Cut % or a range error message) and start over. Last Cut XX.XX% - This provides information only, telling what cut was entered at the last calibration. Do Cal? YN - ing the left arrow will toggle the flashing cursor between N and Y. Selecting Y and then commits you to making a grindout or cut entry. N will put you into the Manual TC Entry Mode. Cal With X Cut - ing the up arrow allows selection of either one or two cuts. Select 1 for one-cut calibration. Select 2 for two-cut calibration with auto TC. Cut X.XX% - cut or grindout value for calibration. Manual TC = XXXX - Displays TC value for temperature compensation. Suggested default is 600 (for 5% units). Use zero if no temperature compensation is desired. Auto Set TC YN? - Use with second cut. Select Y to proceed with an automatic calculation on the TC value. Selecting N will leave the TC value unchanged. Auto Set TC = XXXX - Resulting TC value from a TC calculation. Auto Set Fail/Cuts Too Similar - An advisory message which tells you that the Auto Set TC was not successful due to the two temperatures being too close together or that the cut or grindout information does not agree with the type of change expected for oils. For example, the dielectric constant of the oil should decrease with an increase of the temperature. If the cut information does not match this behavior, it is deemed invalid and the Auto Set TC operation will not be accepted. Note: If unit responds with this error after a second attempt to Auto Set the TC value, recheck sample to see if water cut has changed. 20 ma = % - Allows the span of the loop and the 0-5 Vdc output to be set. The 0-5 and 4-20 are directly linked so that 4 ma is the same as 0 Vdc and 20 ma is the same as 5 Vdc. The 20 ma point is always considered the % water where 20 ma will be produced. It is not useful to enter a number greater than the unit range. Set Pt =% - The setpoint value is that value at which the setpoint relay will go to bypass. This is the same as the power off relay position, i.e., the NC contact is closed. The delay value establishes how long the instrument observes a bad oil condition before actually releasing the relay to bad oil. During this time, the red LED on the front panel will flash. At the relay release, the flashing will stop and go to solid red. When in transition from bad oil to good oil, the reverse is true. The green LED will flash until the relay engages, then the LED will go to solid green. Issue/Rev. 0.4 (6/01) Page 3

4 Delay = Sec - Related to the setpoint, this value establishes the number of seconds of delay between a bad oil condition (red LED flashing) and release of the relay to bypass (solid red LED). The reverse condition (green LED and transition to good oil) will occur in 1/10th the delay time. Low Dk Alarm? YN - This allows you to choose if you want the relay to go to bad oil, and the analog outputs to go high, on a Lo Dk condition in the probe - or - if you want the relay to stay in the good oil position and the analog output to go low. A Yes choice will give you a bad oil relay and high analog outputs while a No choice will give you a good oil relay position and low analog outputs. Undo Changes? YN - This allows the opportunity to reverse or undo all calibration changes made during the past programming session. The selection is automatically N, unless Y is deliberately selected. Y should be used after an Auto Set Fail and prior to attempting Auto Set TC again. Program Done - No action is required here. This is an advisory message telling you that you have finished the programming modes. You only need to press to go into normal operation. Error Messages The INVALCO WCM 7300 continuously calculates a water cut based on a variety of control parameters. If any of these parameters are out of range or are inconsistent with known fluid Dk properties, advisory messages will result. These messages and their meanings are stated below. Lo Dk - The probe value is below the range established for the dielectric constant (Dk) and /or the range of the instrument. A standard WCM 7300 has a Dk tuning range of 1.7 to 5.0 which encompasses a wide range of crude oils and refined products. If the probe value is low due to a low Dk, gas breakout in the oil, probe not completely full, etc., the Lo Dk message will result. Auto Set Fail/Cuts Too Similar - This advisory message only can occur in a Method 2 calibration where you are asking the unit to automatically calculate the TC value. The WCM 7300 requires that two cuts be used, the first being from a previous Method 1 calibration. This message can occur if the temperature information does not match with the Dk change. The Dk must drop with an increase in temperature. If this did not occur by virtue of the type of cuts given, then the calibration is considered invalid; no changes will occur, and the unit will display this message. A second possibility is that the temperature of the first and second cuts are so close that a calculation cannot be made. A minimum product temperature change of 5 F is required. Below Cal Zero - This is a message that will be displayed if the value of the probe goes below the calibrated zero point. The LED will stay green. Over Range - This message will appear if the probe is shorted, full of water, the insulators are coated with a conductive material, or anything that might produce a low resistance reading from the probe center stud to ground. Check Probe Wire - This message advises that the lead from the electronics to the probe is loose. Product Temperature Compensation The base Dk of oils can change radically with changes in temperature resulting in a reading change that appears to be a water cut change, when, in fact it is a Dk shift due to temperature. For example, for a 10 F change a typical crude oil may show a reading shift of as much as 0.1% which would be interpreted as water, not a temperature change. The WCM 7300 measures product temperature and by looking at temperature as well as water cut calculates a corrected cut reading, thus providing a true S&W cut over a wide range of temperatures. There are two ways to calibrate the WCM 7300 to provide this temperature compensation (T.C.). 1. Manually enter an average T.C. number from the chart below. 2. Have the WCM 7300 automatically calculate the T.C. value. Method 1. Manual T.C. (One Cut) During programming the instrument will display Manual TC = when displaying the TC value in use. the default value from the table below or enter some other value, such as a value known to work on other installed WCM s in the same field or with similar crudes. Please note that the temperature compensation is only as accurate as the value used, however, use of an approximate TC value will still improve accuracy by an impressive amount. Remember, all oils change dielectric constant inversely with temperature and any compensation will help to defray this effect. If estimating a TC value, estimate low so that you do not overcompensate. 600 for 5% Unit 450 for 10% Unit 200 for 25% Unit Method 2. Auto T.C. (Two Cuts) This method uses two different cuts and temperatures to automatically determine the TC value for your oil. You first calibrate with one cut and then calibrate a second time with a second cut. The 7300 looks at the two water cuts and two temperatures. It then calculates a temperature compensation value for that particular oil. Note: The second cut must be at a higher temperature and the water content equal to, or lower than the first cut. A minimum temperature increase of 5 F is required for the instrument to perform the Auto TC calibration. Page 4 Issue/Rev. 0.4 (6/01)

5 If the temperatures are too close or the cuts are invalid combinations, the instrument will not perform the TC calculation and will advise you that a problem exists by displaying Auto Set Fail/Cuts Too Similar. When to Use Method 1: 1. For first time calibration. 2. When temperature changes exist, but additional grindouts are not possible, or practical, at other temperatures. When to Use Method 2: 1. When a second cut is possible at a different product temperature. All oils change with the temperature, no two oils change quite the same. Some may change very little while some may change considerably. If real close measurement is not required, then the effects of temperature changes may not be a factor. But, it can be very important in cold climates where the maximum amount of water pipelines will accept is often less than.5%. In these cases, every possible variant must be considered and controlled where possible. Reducing or removing the detrimental effects of temperature changes can often be the difference between success or failure of an installation. Set Point and Loop Calibration The set point, delay, and loop span values are established during programming. It is possible to adjust these values without entering into the cut and TC calibration programming. Entry of these values is described in detail in the following sections. Below is a flow chart programming guide. Each bubble or diamond represents what the display will show. The information adjacent to the small circles between the bubbles instruct you on how to proceed through the programming modes. All Three Buttons Program Mode : Left arrow 3 times Up arrow 2 times 20 ma=x.xx% Last Cut X.XX% Set pt. = X.XX% No Do Cal? Delay XXX Low Dk Alarm Undo Changes Use up arrow to pick 1 or 2 cuts Yes 2 Cuts Cal with Cut 1 Cut Cut X.XX% Left Arrow Cut X.XX% Program Done Cut X.XX% Manual TC = XXXX N Auto Set TC? Auto Set TC = XXX Ready for Operation Figure 2 Issue/Rev. 0.4 (6/01) Page 5

6 Quick Steps for Putting Your WCM 7300 Into Operation Mechanical Installation For best results, install the probe with the following requirements: Probe is in a vertical piping section (in-line probe only). Flow is from bottom to top (in-line probe only). If probe is installed on a pressure vessel, the probe must be installed in piping prior to dump valve. Air or gaseous content is minimized. Note: The probe must be full of oil for proper operation. Caution: Operating the instrument while the probe is empty or partially filled will not damage the instrument, however, invalid readings or Low Dk indication will occur. Electrical Installation Connect Vdc to the terminal block inside the back (non-windowed) cover of the instrument. The power connections are marked +24V and 24V GND. Note: For initial operation, only power is required. The LCD display will provide the necessary information to verify operation. To connect the analog outputs and/or the relay alarm, refer to the detailed section on electrical connections. Field Calibration The WCM 7300 has been factory tested, however, it must be field calibrated as follows. Warm Up Apply power to the WCM Allow the instrument to be powered for at least 10 minutes before calibrating the unit. 1. Bring system into operation with normal flow through the probe. Allow the temperature to stabilize. Note: Since the unit is not yet field calibrated, Error advisory messages may flash on the display. Ignore these until after calibration. 2. Take a grindout for water in the oil. For calibration purposes, the oil should preferably have less than 1% water in it. 3. With the condulet cover removed, depress all three buttons at the same time. 4. When the display reads Program Mode, release the buttons. You are now in programming mode. 5. the Left Arrow button three times and then the Up Arrow button twice. 6. The unit should be displaying Last Cut x.xx% where x.xx is the Cut Value used for the last calibration. Ignore this for now. Note: If you entered the sequence in Step 5 incorrectly, the display will be reading something different. To start over, press until past the display that says Program Done. Then restart at Step to proceed to the next display. 8. The display will now say Do Cal? YN. The N should be flashing (meaning no). Select Y (yes) by pressing the Left Arrow key. The Y will now be flashing. 9. to confirm yes and proceed to the next display. 10. The display should now read CAL with X CUT where X is 1 or 2. The number will be flashing. ing the Up Arrow key will toggle the number between 1 and 2. Select 1 if this is the initial calibration. Select 2 if you are entering the second cut for Auto TC. (See pages 4 and 5.) 11. to proceed to the next display. 12. The display will now be reading ENTER CUT x.xx% where x.xx is the cut value to be used for calibration. both the Up Arrow and the Left Arrow keys at the same time to zero the display. Using the Up Arrow and Left Arrow keys, enter the grindout value (in the x.xx positions) obtained in Step to accept the Cut and to Proceed to the next display. 14. The display will now read Manual TC = xxxx, where xxxx is some number. This is the temperature compensation (TC) factor. It is what sets the temperature compensation for Dk changes with temperature. If you want no compensation, enter 0, otherwise, enter 600 for a 5% unit, 450 for a 10% unit, and 200 for a 25% unit. 15. to accept the TC and proceed to the next display. 16. The display will now read 20 ma = xx.xx%. Where xx.xx is the full scale span desired for the loop. 4 ma will always be equal to 0.00% water, and the 20 ma value is equal to the water % entered here. the value desired by using the up and left arrow keys. to accept the span and to proceed to the next dis play. 17. The display will now read Set Pt = x.xx%. This is the water cut value at which the relay and indicator light go to bad oil as shown by the indicator light blinking red. the value with the Up Arrow and Left Arrow buttons. 18. to accept the setpoint and to proceed with the next display. 19. The display will now read Delay = xxxx Sec. This is the number of seconds the unit will allow bad oil until the relay goes into bypass. the desired value with the Up Arrow and Left Arrow buttons. 20. to accept the delay and to proceed to the next display. 21. The display will now read Low Dk Alarm Yes/No. the center button to toggle from Yes to No. A Yes choice means all outputs will go high if a low Dk condition occurs in the probe. i.e. the relay will go to bad oil. The 0-5v output will go to Page 6 Issue/Rev. 0.4 (6/01)

7 5 volts and the 4-20mA output will go to 20mA. If you choose No, the relay will stay in the good oil position and the analog outputs will stay low. After making your choice, press to confirm your choice and to proceed to the next display. 22. The display will now read Undo Changes? YN with the N flashing for no. The Left Arrow will toggle the cursor between Y and N. Selecting Y would undo all information entered in this pro gramming session and restore the unit to all conditions prior to entering the programming mode. Leave the selection at N if you do not want to change the data just entered. 23. to accept all of the settings and to proceed to the next display. 24. The display will now read Program Done. 25. to leave the program mode. 26. The LCD will now display the grindout value entered unless the cut has changed during calibration. If so, the value displayed will be the new value and not the value entered. Normal Operation The WCM 7300 is now displaying water cut in % water. The Up Arrow button will toggle the display between Cut in %, temperature and probe electrical value. You can toggle the readings by pressing the center up arrow button or using the supplied magnet. The Temperature readings can be changed between C and F by pressing the Left Arrow button. Bypass Relay and Indicator Lights As stated above, the setpoint entry establishes the point at which a cut value becomes a bad oil reading. The programmed delay sets the delay, in seconds, between a bad oil condition and relay release. The indicator LED is green when the cut is below the setpoint, and red when at or above the setpoint. When the LED flashes red, the setpoint is exceeded, but the delay time has not expired. When the relay goes to bypass (delay is over), the LED will go to solid red. The same applies when going from bypass to good oil, with the LED flashing green and then going to solid green. Note: Water contamination in oil can take several physical forms, such as small droplets, slug, or larger globs of emulsion. The WCM 7300 will provide the best indication of contamination in the process stream if the water is well dispersed. Electrical Considerations The WCM 7300 is housed in a NEMA 7 explosionproof enclosure and may be located in any Class I, Division 2, Group C and D environment. The unit requires 24 Vdc, 250 ma (Figure 3). It is possible to install the analog loop as isolated (using an external power supply to power the loop) or nonisolated (using the 24 Vdc on the unit to power the loop). Note: When isolated, the two power supply returns can be allowed to have a maximum difference of 4 Vdc. (See Page 8). Note: The unit is not powered by the loop connection. Figure 3 Programming As with any microprocessor-based measuring device, Installation certain process and control values must be entered into the memory. These values customize the unit for Caution: The condulet is secured in place by an specific customer needs and applications. Information needed is: allen head set screw in the hub where the condulet is attached to the probe. The condulet must not be Span of. rotated. Calibration can be affected and unit damage may also occur (See Figure 3). Relay actuation setpoint. Setpoint time delay. Probe Installation Cut calibration (grindout value). It is recommended that the probe be mounted in a Temperature Coefficient (TC). vertical section of the process piping with the flow upwards through the probe. Trapped air and gases All these values may be entered with three buttons located on the WCM front panel. will cause dramatic changes in the reading due to the high differential of the Dk values between air (or gas) All three buttons are used to program the unit. and oil. This problem is greatly reduced with vertical probe orientation. Issue/Rev. 0.4 (6/01) Page 7

8 Electrical Connections To connect the input power (Figure 4): Figure Power Input 24 Volts DC 250 ma GND +5V SIG SIG GND LOOP+ LOOP- NO NC C Connect 24 Vdc to the unit with the + wire going to the 24+ Terminal and the - wire going to the 24 GND Terminal. Connect the + terminal of the monitoring equipment to the Loop - Terminal. Connect the - terminal of the monitoring equipment to the - terminal of the power supply. Connect the + terminal of the power supply to the Loop + Terminal. To connect the analog output as nonisolated (Figure 7): Install a jumper wire from 24V+ to Loop+. Non-Isolated 4-20mA Analog Outputs Figure GND GND +5V SIG SIG GND LOOP+ LOOP- NO NC C - + Monitoring Device Figure to 5 Volt Analog Output - Signal to Monitoring Device GND +5V SIG SIG GND LOOP+ LOOP- NO NC C To connect the analog voltage output (Figure 5): Connect the analog 0 to 5 volts with the + on the 5V SIG Terminal and the - on the SIG GND Terminal. Note: This signal tracks the output and is not adjustable. To connect the analog output as isolated (Figure 6): Isolated Analog Outputs Isolated Power Supply GND +5V SIG SIG GND LOOP+ LOOP- NO NC C - + Monitoring Device Connect a jumper wire from the 24 + Terminal to the Loop + Terminal. Connect the Loop - Terminal to the + terminal of the monitoring equipment. Connect the - terminal of the monitoring equipment to the 24 GND Terminal. Note: The loop circuit must be powered as either internal (non-isolated) or external (isolated) or it will not produce the analog output. The SPDT relay is labeled with terminals marked Relay. To connect the 10 Amp SPDT relay (Figure 8): Figure 8 COMMON NORMALLY CLOSED NORMALLY OPEN GND +5V SIG SIG GND LOOP+ LOOP- NO NC C The Normally-Open Terminal is labeled NO, the Normally-Closed Terminal is labeled NC, and the Common Terminal is labeled C. When the unit is on, the relay is energized and the connection is made between common (C) and normally-open (NO). In alarm or bypass conditions, or power failure, connection is made between common (C) and normally-closed (NC). Figure 6 Page 8 Issue/Rev. 0.4 (6/01)

9 Troubleshooting (a) NEVER mount a probe down stream of the dump valve when monitoring oil from a pressure vessel as 1. The 24 volt power supply to the 7300 must be good, steady, and ripple free. Half wave rectifier solution gas will break out as the fluid sources normally are not acceptable, producing goes from the higher vessel pressure unreadable displays. to the lower pressure downstream of the valve. An increase in gas will make 2. If the RTD (Resistance Temperature Device) that the reading become smaller. Also, measures the fluid temperature should short or since the size and volume of the gas open the 7300 will continue to operate, but will lose bubbles is constantly changing with its temperature compensating ability. flow, the probe value can be very unstable as it attempts to follow the fluc- a. If it should short, the LCD will alternately flash T Out of Range and the cut reading. If you press tuating gas content. the center button to look at the temperature it will be (b) A change in pressure on the oil as flashing T Out of Range and 32F. the divert value switches from good b. If it should open, the water cut reading will not to bad oil on a LACT. Switching to change, but the LCD will read +/- 250F when the a higher pressure bad oil line can make center button is pressed. the 7300 read higher. Switching to a The RTD is located at the bottom of the hollow stud lower pressure can make it read lower. that comes up into the condulet from the probe. The For good operation, the pressure must stud is the 3/8 threaded rod onto which you attach be kept constant to keep the solution the probe clip wire from the electronic assembly. To gas bubble size constant. Please note remove the RTD, you first remove the electronic that air eliminators will vent slugs of assembly and then pull the RTD out by the cable gas, but not solution gas. going into the hollow stud. The RTD is coated with a (3) A change in chemicals, of either volume, white heat transmitting grease. Wipe the grease off type or supplier. Remember that the probe and transfer it onto the new RTD before installing it. looks at/checks everything that flows 3. If the water cut reading drifts, but the shakeouts through it including chemicals, stuffing box show the cut to be constant, check the temperature rubbers, oil, water, minerals, etc. Changing chemical conditions normally cause and probe readings from the LED display. Stop the fluid flow through the probe to see if the reading the greatest trouble as it is easy to forget stabilizes. If it does, then the problem is flow related, that they can affect the Dk of the stream and could be caused by any of the following: and, hence, affect the readings. Normally an increase in chemical will cause the read a. If the temperature is varying, and you are on ings to increase. However, just changing manual TC, you may need to: types and/or suppliers usually will require (1) Go to the two cut method and let the 7300 a recalibration after the system has stabilized. calculate it s own temperature compensation factor. (4) Other things that can cause troubles are: (2) Change the manual TC number. The 600 (a) Having loose fitting on the suction side number is a TC that normally is good for of the pump that is pumping the fluid most oils, but may not be for yours. If the through the monitor probe. The pump indicated water cut goes up with an increase in temperature, the manual TC if it had gas in it. will suck in air causing the oil to act as number is too high and should be reduced. Since all oils vary in their reaction to temperature changes, it is not possible to say (b) Mounting the probe directly on the pump discharge. This will/may be ok how much reduction in TC is needed. as long as the pump has plenty of suction head, is not over speeding, has Some experimenting may be required. Conversely, if the indicated cut goes down the proper impeller, etc. But the possibility for trouble always exists. with a temperature increase, you need to increase the TC value. (c) Mounting the probe directly to a static b. If the probe value is varying, look for: mixer. A static mixer functions by mixing (as violently as possible) the fluid (1) An increase in the API gravity of the oil. going through it. The fluid exiting the This will cause the value to go down. Conversely, a decrease in API gravity will and will cause erratic readings. If the mixer is normally still full of bubbles cause the reading to increase. This is not mixer has been installed backwards, a linear function, and varies from oil to oil, the results are disastrous. but generally is consistent. (2) A variation in the amount of solution gas in the oil. Issue/Rev. 0.4 (6/01) Page 9

10 (5) Probe Problems All internal wetted parts of the probe are either teflon or coated by a baked on epoxy. Normally a probe will give many years of service without any problems. How ever, chemicals added to the process stream often will cause a conductive film to coat over the teflon insulators and the epoxy coating causing much trouble. Often you can check for this without removing the probe from the line by doing the following: (a) Actuate the center Up é button on the 7300 until the valve of the probe is displayed. It is the number on the right. Any value over 350 pf is suspect. (b) Remove the 24 volts power to the Remove the two screws hold ing the electronic assembly into the condulet. Gently pull the electronic assembly out, and to the side, so you can disconnect the clip from the electronics to the probe center stud. (1) Measure the resistance from the center stud to the condulet - or some other grounded object. The resistance should be infinity. Any reading less than 250,000 ohms is bad. (2) Switch the V-O-M to low range D.C. volts. Check for voltage from the center stud to ground. The voltage should be zero. Any voltage higher than.25 volts is bad. If you observed questionable reading in any of the two above checks, the teflon insulators are beginning to either be coated, or impregnated by chemicals and need to be replaced or cleaned. General Comments 1. The LCD will read Check Probe Wire if the lead from the electronic assembly to the probe is loose, not attached, or the probe is empty. The LED will blink red for the amount of time delay set in the unit, and then go solid red. At the same time the relay will actuate. If you press the center button to the probe value position, the number in the right position will be up around If the unit is in operation and the Dk of the fluid going through the probe falls, the LCD will go to If the Dk continues to fall the LCD will flash Below Cal Zero. The LED will stay green and the relay will stay in the good oil position. You may be able to reprogram and recalibrate from the Below Cal Zero reading, but the center push button/magnet will not operate as long as the Below Cal Zero signal is flashing. If you try to recalibrate and the Dk is too low, the 7300 will flash Auto Set Fail/Low Dk indicating that the probe value is too low for calibration and that the instrument will go into Under Range if the value goes much lower. Whether calibration is possible depends on the probe value when the initial calibration was made. If the oil had a normal Dk such that the beginning probe value was 150 pf (or more) then you probably will be able to recalibrate from the Below Cal Zero condition. But, for instance, if you have a high API crude, with possible some solution gas in it and the 7300 goes to Below Cal Zero --the probe value may be less than 140 pf. If you try to recalibrate under these conditions, the 7300 will show Auto Set Fail during the reprogramming telling you that the probe, even though it may be full, such as a low value that readings will not be accurate or reliable. 3. If the Dk should continue to drop causing the probe value to decrease even further, the Under Range message will occur on instruments manufactured prior to April 15, The LED will blink red for the time delay setting and then go solid red. The relay will actuate to the oil by passing position. Note that the probe value numbers (that you can bring up on the LCD) become invalid anytime the Under Range message is showing. 4. However, software was changed on April 15, 2001 in order to offer a field selectable output choice in case the Dk of the fluid in the probe falls below the range of the instrument. While the 7300 previously would go to Under Range, indicating gassy fluid, probe not full, etc. it now will read Low Dk -- not Under Range with these conditions. Please note that the Over Range function has not changed. Excessive water, a shorted probe, too much chemical, or anything that causes the probe value to go to high, will cause the 7300 to read Over Range. This causes the relay to operate and the analog outputs to go high. The normal tuning range of the 7300 is such that it covers all known oils. Electronically this produces probe values of approximately 140 to 350 pf. The Low Dk message will occur if the probe value falls below 140 pf and the Over Range message will occur if the probe value exceeds 350 pf for a 0-5% unit. Some customers consider a low probe reading to be a matter of concern just the same as a high reading and want the output to go high on either Low or High probe values so they can investigate the cause of the readings. Other customers, however, do not have the same requirements and want the 7300 to stay on Low output on Low Dk conditions. Consequently, the software has been changed to allow you to make your output choice during calibration. The modification added is the final step in the program menu. Page 10 Issue/Rev. 0.4 (6/01)

11 5. The 7300 cannot be reprogrammed or calibrated in either the Low Dk or Over Range condition. If you try, it will flash Low Dk/Over Range and Auto Set Fail when you try to enter a cut value. However, once the lo, or high, probe value has been brought back to normal, you can then reprogram/recalibrate if necessary. If nothing changed, other than whatever initially caused the probe value to go out of range, the 7300 will go back to normal operation on its own as soon as the abnormal conditions are corrected. 6. The probe values you can pull up on the LCD by pressing the center button (twice), or by using the supplied magnet, will not be correct in either the Low Dk or Over Range condition. Due to variations in reed switches and magnets, it may not always be possible to pull up the probe values by moving the magnet across the face of the condulet as per the instructions in the old 7300 Manual. If this should occur, run the magnet from front to rear (on top of the condulet) at the 11 o clock position. Moving it from front to rear at 2 o clock will also work. 7. If the probe s electrical value keeps falling the unit will go to Check Probe Wire 8. the button as required to get back to the operation mode. 9. Note that the water cut value entered during programming may take several seconds to stabilize on the LCD after you go into the operation mode. This is normal. 10. Sometimes it may not come back to exactly the same as was entered. This is also normal. The reason for this is that the 7300 immediately starts taking measurements and doing calculations as you enter information. Thus, if the water cut, gas content, chemicals, or anything going through the probe changes during programming, the 7300 will display new numbers -- reflecting these changes -- and not display the original value entered. Normally these variations are in the hundredth s of a percent, but may be larger dependent on the magnitude of the changes. 11. It takes a Dk change of only to produce a readout change of.01 percent water. This is a small change, but the 7300 is very sensitive and easily catches it. Changes of this magnitude (and greater) are occurring constantly during flow. This is seen on the LCD as the last digit going up, or down, randomly. Again, this is normal. 12. The ground electrical connection from the probe to the 7300 electronics is through the threads of the condulet where it screws onto the probe. For this reason, the condulet must be securely screwed onto the probe and the allen screw going through the condulet hub into the probe adaptor threads must be tight. A loose condulet can result in readings jumping large values anytime the probe/condulet is moved or shaken. 13. The 7300 checks the probe for value changes very fast -- in the millionth of a second. It is not sensitive to the rate of flow through a probe which is slow compared to the However, high flow rates can cause problems due to turbulence with resulting foaming, and gas breakout, as the oil flows through the piping prior to the probe, and in the probe itself. For best results flow rates of 10 linear feet per second or less is recommended. 14. It is recommended to hook-up the 24 volt wiring to the 7300 with no voltage applied until after the wiring is firmly attached to the 7300 power terminals, then apply the 24 volts to the wires. The reason for this is to prevent sparking (no matter how small) at the terminals. Sparking can cause short duration instantaneous voltage spikes into the 7300 affecting the power supply regulators and the software. Some times, but seldom, this will prevent the LCD from displaying or you will get a lot of dashes etc. If this occurs, power down and then back up again. Issue/Rev. 0.4 (6/01) Page 11

12 Dimensions Inches (mm) Assembly Probe Dimensions - Inches (mm) No. Size A B C D E F G " 150# 17.0 (432) 8.5 (216) 4.5 (114) 4.5 (114) 8.0 (203) 5.3 (135) 8.0 (203) " 150# 32.0 (813) 16.0 (406) 4.5 (114) 4.5 (114) 8.0 (203) 5.3 (135) 8.3 (211) " 150# 32.0 (813) 16.0 (406) 4.5 (114) 4.5 (114) 8.0 (203) 5.3 (135) 8.8 (224) " 150# 32.0 (813) 16.0 (406) 4.5 (114) 4.5 (114) 8.0 (203) 5.3 (135) 9.9 (251) Note: Dimensions - Inches to the nearest tenth (millimeters to the nearest whole mm). The specifications contained herein are subject to change without notice and any user of said specifications should verify from the manufacturer that the specifications are currently in effect. Otherwise, the manufacturer assumes no responsibility for the use of specifications which may have been changed and are no longer in effect. FMC INVALCO Fluid Control P.O. Box 1377, Stephenville, TX 76401, Phone: 254/ , FAX: 254/ , Toll Free: 800/ Page Printed 12 in U.S.A. 6/01 FMC INVALCO All rights reserved. Issue/Rev. 0.4 (6/01) Issue/Rev. 0.4 (6/01)